I can't get it to boot no matter what from the moment I put it all together. I have everything out on a bench now with just psu connected, and one ram stick and when I short the power header, the fans quarter turn, light flicks on/ off then nothing. I have to disconnect power to psu, plug back in but then same thing happens. This is with a brand new Corsair CX650M psu, which I bought to try and fix my old system that had same problem. My old system......i5-4690, Asus A97-A mobo, RX480 graphics. Ran sweet for a few years but started to spontaneously crash. I mean it's like someone pulled the power cord out. Only way to boot again was to unplug the psu, wait a while then plug back in. Sometimes it was only when I disconnected something.....Anyway I then figured it was a psu or motherboard problem so bought a new psu- the Corsair 650W. Seemed to fix it but oddly after about 2 weeks, PC started crashing again, same thing. At this point I had enough so bought all new system, except graphics card and now here I am.......no boot whatsoever I've tried .... double checking cpu install, cooler, etc as well as standoffs... connecting both old and new psu resetting CMOS different power cable, power point...... one stick ram, 2 sticks, different slots with/ without graphics connected I can't think of anything else to try and am totally stuck. It's like it's a short but how can that be for two different systems outside the case???? Please help!!